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Antigen receptor ITAMs provide tonic signaling by acting as guanine nucleotide exchange factors to directly activate R-RAS2.
Sci Signal
January 2025
Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
The small GTPase R-RAS2 regulates homeostatic proliferation and survival of T and B lymphocytes and, when present in high amounts, drives the development of B cell chronic lymphocytic leukemia. In normal and leukemic lymphocytes, R-RAS2 constitutively binds to antigen receptors through their immunoreceptor tyrosine-based activation motifs (ITAMs) and promotes tonic activation of the phosphatidylinositol 3-kinase (PI3K) signaling pathway. Here, we examined the molecular mechanisms underlying this direct interaction and its consequences for R-RAS2 activity.
View Article and Find Full Text PDFAssociation of Specific Gene Mutations with Immunoglobulin Heavy-Chain Variable Region and Chromosomal Alterations in Chronic Lymphocytic Leukemia Patients in India.
Asian Pac J Cancer Prev
January 2025
Principal Scientific Officer & Molecular Advisor, Rajiv Gandhi Cancer Institute & Research Centre, New Delhi, India.
Chronic lymphocytic leukemia (CLL) is a less common hematological malignancy in Indian people. It accounts for less than 5% of all leukemias. Information on genomic alteration in CLL is limited immunoglobulin heavy-chain variable region (IGHV) mutational status is considered the most reliable prognostic marker.
View Article and Find Full Text PDFCause-Specific Mortality and Prognostic Impact of Comorbidity in Japanese Patients With Chronic Lymphocytic Leukemia.
Cancer Med
February 2025
Division of Hematology/Oncology, Department of Internal Medicine, Kameda Medical Center, Chiba, Japan.
Background: Due to its rarity, there are very limited data available on the cause of death (COD) and its association with comorbidities in Japanese chronic lymphocytic leukemia (CLL) patients.
Methods: To investigate the prevalence of comorbidities and their impact on cause-specific mortality, we retrospectively reviewed 121 Japanese patients with CLL.
Results: The median age was 69 years, with 47.
Chronic Lymphocytic Leukemia: 2025 Update on the Epidemiology, Pathogenesis, Diagnosis, and Therapy.
Am J Hematol
January 2025
Department I of Internal Medicine and Medical Faculty, University of Cologne, Köln, Germany.
Disease Overview: Chronic lymphocytic leukemia (CLL) is the most frequent type of leukemia. It typically occurs in older patients and has a highly variable clinical course. Leukemic transformation is initiated by specific genomic alterations that interfere with the regulation of proliferation and apoptosis in clonal B-cells.
View Article and Find Full Text PDFLymphomatoid Papulosis Type E With T-Cell Receptor Gamma Positivity.
Clin Cosmet Investig Dermatol
January 2025
Division of Dermatology, Department of Medicine, Faculty of Medicine, Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Lymphomatoid papulosis (LyP) is currently categorized as a primary lymphoproliferative disorder that follows a chronic, recurrent clinical course. The diagnosis of LyP is mainly based on clinical presentation and histopathological correlation. Six subtypes of LyP have been described and recognized, each with different histological features and sometimes distinct clinical presentations.
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